NDLI: Lattice-Match Stabilization and Magnetic Properties of Metastable Epitaxial Permalloy-Disilicide Nanostructures on a Vicinal Si(111) Substrate

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Lattice-Match Stabilization and Magnetic Properties of Metastable Epitaxial Permalloy-Disilicide Nanostructures on a Vicinal Si(111) Substrate

Content Provider	MDPI
Author	Bhukta, Anjan Horvitz, Dror Kohn, Amit Goldfarb, Ilan
Copyright Year	2021
Description	We report the epitaxial formation of metastable $γ-(Fe_{x}Ni_{1−x})Si_{2}$ nanostructure arrays resulting from the reaction of $Ni_{80}Fe_{20}$ permalloy with vicinal Si(111) surface atoms. We then explore the effect of structure and composition on the nanostructure’s magnetic properties. The low-temperature annealing (T < 600 °C) of a pre-deposited permalloy film led to solid-phase epitaxial nucleation of compact disk-shaped island nanostructures decorating ledges of the stepped surface, with either (2 $\times$ 2) or ( $\sqrt{3\times\sqrt{3}}$ ) R30° reconstructed flat top faces. High resolution scanning transmission electron microscopy analysis demonstrated fully coherent epitaxy of the islands with respect to the substrate, consistent with a well-matched $CaF_{2}$-prototype structure associated with $γ-FeSi_{2}$, along perfect atomically sharp interfaces. Energy dispersive spectroscopy detected ternary composition of the islands, with Fe and Ni atoms confined to the islands, and no trace of segregation. Our magnetometry measurements revealed the superparamagnetic behavior of the silicide islands, with a blocking temperature around 30 K, reflecting the size, shape, and dilute arrangement of the islands in the assembly.
Starting Page	1310
e-ISSN	20794991
DOI	10.3390/nano11051310
Journal	Nanomaterials
Issue Number	5
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-05-16
Access Restriction	Open
Subject Keyword	Nanomaterials Quantum Science and Technology Γ-(feni)si2 Nanoisland Epitaxial Silicide Superparamagnetism Scanning Tunneling Microscopy
Content Type	Text
Resource Type	Article

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